Reset the seenObjects cache when changing collections.

Fixes ignoring email with the same uid as an already sent email from
another folder with the same uid.
Log this.
CHANGES
Prepare for RC1
Released Horde_ActiveSync-2.4.0RC1
Development mode for Horde_ActiveSync-2.4.0RC2
Ignore the OPTIONS node for SMS until we support it.

Client really shouldn't be sending this unless SMS is selected for sync,
but this prevents corrupting the sync cache with the incorrect collection class
if it does.

Final (?) fix for Bug: 12281
Stronger language recommending against this
Fix JS error
[mms] Fixed segfaults caused by SMTP debugging.
Fix scope.

Fixes fatal error when updating filters.
BFN
More sensible default.
typos
More correct way of doing shutdown task
doc updates

imapproxy is no longer HIGHLY RECOMMENDED.  Newer IMAP servers have
little/no overhead in creating new connections.
Update sidebar for H5.
Formatting
phpdoc
Move search to topbar.